C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Engine Making Chirping Noise

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Old Apr 10, 2016 | 02:19 AM
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Default Engine Making Chirping Noise

Hello!
My '89 keeps making this kinda loud Chirping noise. I'm having a hard time figuring out what it is. I thought it was the belt, so I did that little bar of soap trick and the sound was still there.
So I put my ear around the car and the belts sound normal but I found the area where the sound is coming from. It's by the engine block, where it says "Tuned Port Injection"(or where the engine air intake hose first starts). Anybody take any guesses on what it is?

Last edited by MrHappy66; Apr 10, 2016 at 02:21 AM.
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Old Apr 10, 2016 | 02:44 AM
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that would be the Throttle Body. Possible small vacuum air / hose leak.
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Old Apr 10, 2016 | 09:38 AM
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Originally Posted by THE 383 admiral
that would be the Throttle Body. Possible small vacuum air / hose leak.
you could take the belt off to test.
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Old Apr 10, 2016 | 01:43 PM
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Thank you guys!! One more question though, is the tensioner pulley supposed to shake vertically during while the engine is running?
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Old Apr 10, 2016 | 02:08 PM
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Originally Posted by MrHappy66
Thank you guys!! One more question though, is the tensioner pulley supposed to shake vertically during while the engine is running?

it will bounce a bit
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Old Apr 10, 2016 | 02:56 PM
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Try running it without the belt
If it still makes noise see if the balancer is hitting the timing cover

If it isnt pull the valvecovers off you may have your answer there.
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Old Apr 10, 2016 | 03:30 PM
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Check for pulley alignment, too. See if the belt is riding an edge of any pulley's that aren't grooved. You can try squirting some water on the belt and see if the chirp goes away.
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